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Hello my patrons! On today's video, we have an Amiga 500 repair. This machine has the infamous green screen at power on. It usually means "bad RAM" -- but which chip. You know me, I don't like to just desolder everything -- I like to find out WHICH chip is bad.  After getting stuck, I end up using the AmigaDiag ROM to see if it helps. Did it help? Well watch to find out. 

Direct Link: https://www.youtube.com/watch?v=4tctcKUjmUc

Files

Did the Amiga Diagnostic ROM help me figure out what was wrong with this Amiga 500?

This Amiga 500 is giving me the green screen of death. Let's try to figure out exactly what's wrong with it, and then fix it. I end up trying to use the Amiga DiagROM to help me, but it was unfortunately of limited help. --- Video Links Amiga DiagROM: https://github.com/ChuckyGang/DiagROM Adrian's Digital Basement Merch store: https://my-store-c82bd2-2.creator-spring.com/ Adrian's Digital Basement ][ (Second Channel) https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g Support the channel on Patreon: https://www.patreon.com/adriansdigitalbasement -- Tools Deoxit D5: https://amzn.to/2VvOKy1 http://store.caig.com/s.nl/it.A/id.1602/.f O-Ring Pick Set: (I use these to lift chips off boards) https://amzn.to/3a9x54J Elenco Electronics LP-560 Logic Probe: https://amzn.to/2VrT5lW Hakko FR301 Desoldering Iron: https://amzn.to/2ye6xC0 Rigol DS1054Z Four Channel Oscilloscope: https://www.rigolna.com/products/digital-oscilloscopes/1000z/ Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier: https://amzn.to/3adRbuy TL866II Plus Chip Tester and EPROM programmer: (The MiniPro) https://amzn.to/2wG4tlP https://www.aliexpress.com/item/33000308958.html TS100 Soldering Iron: https://amzn.to/2K36dJ5 https://www.ebay.com/itm/TS100-65W-MINI-Digital-OLED-Programmable-Soldering-Iron-Anti-static-Structure/113382669853 EEVBlog 121GW Multimeter: https://www.eevblog.com/product/121gw/ DSLogic Basic Logic Analyzer: https://amzn.to/2RDSDQw https://www.ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-16Ch-100MHz-4Ch-400MHz-Xilinx-Spartan-6-FPGA/202543965672 Magnetic Screw Holder: https://amzn.to/3b8LOhG https://www.harborfreight.com/4-inch-magnetic-parts-tray-90566.html Universal ZIP sockets: (clones, used on my ZIF-64 test machine) https://www.ebay.com/itm/14-16-18-20-24-28-32-40-pin-IC-Test-Universal-ZIF-Socket-Fs/303206721971 RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI) http://www.retrotink.com/ Plato (Clone) Side Cutters: (order five) https://www.ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-PLATO-170-Electronics-Cutter-Side-Cutting-Pliers/163458746184 Heat Sinks: https://www.aliexpress.com/item/32537183709.html Little squeezy bottles: (available elsewhere too) https://amzn.to/3b8LOOI --- Links My GitHub repository: https://github.com/misterblack1?tab=repositories Commodore Computer Club / Vancouver, WA – Portland, OR – PDX Commodore Users Group https://www.commodorecomputerclub.com/ --- Instructional videos My video on damage-free chip removal: https://www.youtube.com/watch?v=XQVjwPsVFd8 --- Music Intro music and other tracks by: Nathan Divino @itsnathandivino

Comments

Carsten Lervad

You know, the "new" T56 successor to the MiniPro can easily program 27C400s, 27C800s, or even 27C160 EPROMs without the use of any adaptor-boards... and it even does the 4 times larger 27C160s surprisingly fast with proper verification tests too... in comparison to the TL866II. I have still kept my old TL866II Plus, though. Simply because it has always served me well... and also just in case I should still need it for whatever reason. BTW. I still have my very own (my precious) A500 from back then. It is the very same rev. 6a codename "rock lobster" motherboard... and it is showing, if not exactly the same, then at least very similar symptoms. So, to claim that I am a bit ecstatic about you doing a repair on this particular issue, would be a serious understatement.

Anonymous

Always fun to see you work on Amigas, Adrian! I repaired my own Rev 6 NTSC A500 early this year, and it had all four Siemens RAM chips test bad. Did your chips have 1991 date codes too? That may have been a particularly bad year for Siemens fabs.